Hi Alex,
FYI, there are new smatch warnings show up in
tree: git://github.com/awilliam/linux-vfio.git vfio-vga
head: 2c2e21fa66c40ed7b8e434c86a9f2ab0c879f21d
commit: c5b7a5a85fa477e70497c513f2acda50eea73bf7 [4/5] vfio-pci: Add support
for legacy MMIO & I/O port towards VGA support
New smatch warnings:
drivers/vfio/pci/vfio_pci_rdwr.c:191 vfio_pci_legacy_mem_rw() warn: consider
using resource_size() here
drivers/vfio/pci/vfio_pci_rdwr.c:206 vfio_pci_legacy_mem_rw() warn: always true
condition '(done >= 0) => (0-u32max >= 0)'
drivers/vfio/pci/vfio_pci_rdwr.c:254 vfio_pci_legacy_io_rw() warn: always true
condition '(done >= 0) => (0-u32max >= 0)'
Old smatch warnings:
drivers/vfio/pci/vfio_pci_rdwr.c:170 vfio_pci_bar_rw() warn: always true
condition '(done >= 0) => (0-u32max >= 0)'
vim +191 drivers/vfio/pci/vfio_pci_rdwr.c
c5b7a5a8 Alex Williamson 2013-01-16 185 if (vdev->has_vga && pos >=
0xa0000 && pos < 0xc0000) {
c5b7a5a8 Alex Williamson 2013-01-16 186 void __iomem *mem;
c5b7a5a8 Alex Williamson 2013-01-16 187 size_t done;
c5b7a5a8 Alex Williamson 2013-01-16 188
c5b7a5a8 Alex Williamson 2013-01-16 189 count = min(count,
(size_t)(0xc0000 - pos));
c5b7a5a8 Alex Williamson 2013-01-16 190
c5b7a5a8 Alex Williamson 2013-01-16 @191 mem =
ioremap_nocache(0xa0000, 0xc0000 - 0xa0000);
c5b7a5a8 Alex Williamson 2013-01-16 192 if (!mem)
c5b7a5a8 Alex Williamson 2013-01-16 193 return -ENOMEM;
c5b7a5a8 Alex Williamson 2013-01-16 194
c5b7a5a8 Alex Williamson 2013-01-16 195 ret =
vga_get_interruptible(vdev->pdev, VGA_RSRC_LEGACY_MEM);
c5b7a5a8 Alex Williamson 2013-01-16 196 if (ret) {
c5b7a5a8 Alex Williamson 2013-01-16 197 iounmap(mem);
c5b7a5a8 Alex Williamson 2013-01-16 198 return ret;
c5b7a5a8 Alex Williamson 2013-01-16 199 }
c5b7a5a8 Alex Williamson 2013-01-16 200
c5b7a5a8 Alex Williamson 2013-01-16 201 done = do_io_rw(mem,
buf, pos - 0xa0000, count, 0, 0, iswrite);
c5b7a5a8 Alex Williamson 2013-01-16 202
c5b7a5a8 Alex Williamson 2013-01-16 203 vga_put(vdev->pdev,
VGA_RSRC_LEGACY_MEM);
c5b7a5a8 Alex Williamson 2013-01-16 204 iounmap(mem);
c5b7a5a8 Alex Williamson 2013-01-16 205
c5b7a5a8 Alex Williamson 2013-01-16 @206 if (done >= 0)
c5b7a5a8 Alex Williamson 2013-01-16 207 *ppos += done;
c5b7a5a8 Alex Williamson 2013-01-16 208
c5b7a5a8 Alex Williamson 2013-01-16 209 return done;
c5b7a5a8 Alex Williamson 2013-01-16 210 }
c5b7a5a8 Alex Williamson 2013-01-16 211
c5b7a5a8 Alex Williamson 2013-01-16 212 return -EINVAL;
c5b7a5a8 Alex Williamson 2013-01-16 213 }
c5b7a5a8 Alex Williamson 2013-01-16 214
c5b7a5a8 Alex Williamson 2013-01-16 215 ssize_t vfio_pci_legacy_io_rw(struct
vfio_pci_device *vdev, char __user *buf,
c5b7a5a8 Alex Williamson 2013-01-16 216 size_t
count, loff_t *ppos, bool iswrite)
c5b7a5a8 Alex Williamson 2013-01-16 217 {
c5b7a5a8 Alex Williamson 2013-01-16 218 int ret;
c5b7a5a8 Alex Williamson 2013-01-16 219 loff_t pos = *ppos &
VFIO_PCI_OFFSET_MASK;
c5b7a5a8 Alex Williamson 2013-01-16 220
c5b7a5a8 Alex Williamson 2013-01-16 221 if (vdev->has_vga &&
c5b7a5a8 Alex Williamson 2013-01-16 222 ((pos >= 0x3b0 && pos <
0x3bc) || (pos >= 0x3c0 && pos < 0x3e0))) {
c5b7a5a8 Alex Williamson 2013-01-16 223 void __iomem *io = NULL;
c5b7a5a8 Alex Williamson 2013-01-16 224 loff_t off;
c5b7a5a8 Alex Williamson 2013-01-16 225 size_t done;
c5b7a5a8 Alex Williamson 2013-01-16 226
c5b7a5a8 Alex Williamson 2013-01-16 227 switch (pos) {
c5b7a5a8 Alex Williamson 2013-01-16 228 case 0x3b0 ... 0x3bb:
c5b7a5a8 Alex Williamson 2013-01-16 229 count =
min(count, (size_t)(0x3bc - pos));
c5b7a5a8 Alex Williamson 2013-01-16 230 io =
ioport_map(0x3b0, 0x3bc - 0x3b0);
c5b7a5a8 Alex Williamson 2013-01-16 231 off = pos -
0x3b0;
c5b7a5a8 Alex Williamson 2013-01-16 232 break;
c5b7a5a8 Alex Williamson 2013-01-16 233 case 0x3c0 ... 0x3df:
c5b7a5a8 Alex Williamson 2013-01-16 234 count =
min(count, (size_t)(0x3e0 - pos));
c5b7a5a8 Alex Williamson 2013-01-16 235 io =
ioport_map(0x3c0, 0x3e0 - 0x3c0);
c5b7a5a8 Alex Williamson 2013-01-16 236 off = pos -
0x3c0;
c5b7a5a8 Alex Williamson 2013-01-16 237 break;
c5b7a5a8 Alex Williamson 2013-01-16 238 }
c5b7a5a8 Alex Williamson 2013-01-16 239
c5b7a5a8 Alex Williamson 2013-01-16 240 if (!io)
c5b7a5a8 Alex Williamson 2013-01-16 241 return -ENOMEM;
c5b7a5a8 Alex Williamson 2013-01-16 242
c5b7a5a8 Alex Williamson 2013-01-16 243 ret =
vga_get_interruptible(vdev->pdev, VGA_RSRC_LEGACY_IO);
c5b7a5a8 Alex Williamson 2013-01-16 244 if (ret) {
c5b7a5a8 Alex Williamson 2013-01-16 245
ioport_unmap(io);
c5b7a5a8 Alex Williamson 2013-01-16 246 return ret;
c5b7a5a8 Alex Williamson 2013-01-16 247 }
c5b7a5a8 Alex Williamson 2013-01-16 248
c5b7a5a8 Alex Williamson 2013-01-16 249 done = do_io_rw(io,
buf, off, count, 0, 0, iswrite);
c5b7a5a8 Alex Williamson 2013-01-16 250
c5b7a5a8 Alex Williamson 2013-01-16 251 vga_put(vdev->pdev,
VGA_RSRC_LEGACY_IO);
c5b7a5a8 Alex Williamson 2013-01-16 252 ioport_unmap(io);
c5b7a5a8 Alex Williamson 2013-01-16 253
c5b7a5a8 Alex Williamson 2013-01-16 @254 if (done >= 0)
c5b7a5a8 Alex Williamson 2013-01-16 255 *ppos += done;
c5b7a5a8 Alex Williamson 2013-01-16 256
c5b7a5a8 Alex Williamson 2013-01-16 257 return done;
---
0-DAY kernel build testing backend Open Source Technology Center
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